Auto merge of #115354 - matthiaskrgr:rollup-4cotcxz, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - #111580 (Don't ICE on layout computation failure)
 - #114923 (doc: update lld-flavor ref)
 - #115174 (tests: add test for #67992)
 - #115187 (Add new interface to smir)
 - #115300 (Tweaks and improvements on SMIR around generics_of and predicates_of)
 - #115340 (some more is_zst that should be is_1zst)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors